I dislike both because of smell. I use WD40 to clean and soften gunk and then after it's clean I clean it with brake clean to remove andy residue. This way I don't get high from that smell

like the post above carb cleaner leaves a residue, while brake cleaner for the most part does not.
I have to warn anyone who uses brake parts cleaner to clean throttle valves and around the intake, what comes out of the tail pipe when started is very toxic....
You can't even get good carb cleaner anymore. The stuff that would eat the skin off your hands worked best.
I wonder when they stopped making the stuff in that formula? I have an old gallon of carb cleaner with the little basket that I bought and used around 1992-1994 and it did cause the top layer of skin on my hands to die and drop off! I still have that gallon of cleaner but I do not use it very often.
I also have a small can that is starting to leak. I wondered why, now I know. I already used the cleaner but have continued using the can and parts basket with lacquer thinner for cleaning.I lost an unopened gallon when it ate through the bottom of the can!
You might think about transferring it to a new can (properly labeled, of course) every couple of years. I lost an unopened gallon when it ate through the bottom of the can!

I dislike both because of smell. I use WD40 to clean and soften gunk and then after it's clean I clean it with brake clean to remove andy residue. This way I don't get high from that smell


Carb cleaner is more flammable? lol
Surprised someone has not mentioned this already:
Do NOT use brake cleaner to clean parts prior to welding. The off gases can kill.
You can't even get good carb cleaner anymore. The stuff that would eat the skin off your hands worked best.
Depends on the brake cleaner. CRC Brakleen in the red can, for example, is a chlorinated solvent and does not burn (but releases toxic gases when exposed to flame). Brakleen in the green can, on the other hand, is non-chlorinated and is quite flammable. Smells like aerosol carb cleaner, in fact -- I expect that they are chemically quite similar.
Dear Sir:
The product in both cans are the same. The two cans are offered to
meet our customer requirements.
Christine Richie
Technical Information Specialist
CRC Industries, Inc.
Just to revive an old thread, the CRC red and green Brakleen are the same thing nowadays. At least in California. They're both labeled as being non-chlorinated, and their MSDS's looked strikingly similar to me (mostly a combo of alcohol with some nasty organic funk mixed in — chlorinated or not don't breathe it if you can help it). When I e-mailed CRC I got this response:
Dear Sir:
The product in both cans are the same. The two cans are offered to
meet our customer requirements.
Christine Richie
Technical Information Specialist
CRC Industries, Inc.
The 'power jet' new nozzles are nice, much easier to get the straw to fit into and get a nice controlled flow.